Hitze Insights
Piping & Heating Technical Guides
Specification, certification and sourcing guides for wholesalers, contractors and private-label brands — written from the Hitze engineering desk.
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Latest technical guides
NSF 61-G, 61-9, 61-4 and 61-8: What the Marks Mean
Decode legacy NSF 61-G and section numbers 4, 8 and 9, then separate a marking’s meaning from the current product listing and…
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Plastic Pipe Firestop Submittals: Match the Tested System
Match the tested firestop system to your plastic pipe, couplers and site conditions. Build a traceable US/Canada submittal before installation.
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Polypropylene Pipe on a US Spec: Separate Material and Duty
Specify polypropylene pipe by service, material and joining system. Separate pressure-water evidence from non-pressure corrosive-waste requirements.
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Pipe Sleeves Through Walls and Slabs: Sizing for Thermal Movement on Plastic Pipe (Not Firestopping)
Size a sleeve for PP-R and plastic pipe: code and spec clearances (IPC 305.3, NJ 2.12, MasterSpec 220517), wall movement, insulation, the…
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Dielectric Unions: Which Code Clause Requires One, Why They Fail, and What Plastic Pipe Changes
IPC 2024, UPC 2021 and IRC 2024 clauses by metal pair, ASSE 1079 ratings (125 psi at 180 °F minimum), field failure…
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Schedule, SDR or PN? Reading Wall Thickness Across Steel, PVC and PP-R Specifications
A schedule fixes one wall per pipe size; an SDR fixes the OD-to-wall ratio; PN sets no wall. Figures from ASME B36.10-2022,…
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Go/No-Go Thread Gauges at Goods-In: Verifying the Brass Inserts on Plastic Fittings
Gauge Rp, R, G and NPT brass-insert threads on PP-R fittings at goods-in: ISO 7-2 step plugs, the ISO 228-2 two-turn NOT…
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How a Moulded PP-R Fitting Is Traced: Cavity Numbers, Lot Codes and the COO Declaration
ISO 15874-3 requires four marks on a PP-R fitting body; cavity and lot codes are optional. How to trace a failed fitting…
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Hitze Plumbers’ Meet in India: A Full House in the Mountains
Hitze took India's plumbers to the mountains for a full day of PPR training, product demos and an evening of live music.…
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PP-R to HDPE: The 3 Transitions and the One You Can’t Fuse
PP-R cannot be fused to HDPE. The three permitted transitions by size band, the bolt torque and re-torque rules, and what to…
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